To form complex representations of sounds, i.e. auditory objects, the auditory system needs to make decisions about which information is part of one object and which is part of another. These decisions are usually taken over a short period of time at the beginning of the sound, known as build-up, by using the available grouping cues. Here we investigate the use of temporal coherence and temporal stability to influence subsequent grouping. We show that these two grouping cues behave independently from one another and except when put into conflict. In these situations, the cues available during the build-up period determine subsequent perception.